Suppose I have Parallax Tide on the field with 5 counters. Could I do this:
A - Remove a counter from Parallax Tide, remove target Land from the game.
Holding Priority
B - Remove a counter from Parallax Tide, remove target Land from the game.
Holding Priority
C - Remove a counter from Parallax Tide, remove target Land from the game.
Holding Priority
Disenchant Targeting Parallax Tide
4 Triggers are put onto the stack with Disenchant at the very top. Disenchant would resolve first and Parallax Tide would leave play. Its own trigger would activate and return all lands it exiled back to play (no lands were exiled)
C, B then A would trigger removing the land forever because Parallax Tide is gone.
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I'm actively maintaining a comprehensive article to help explain to new cube players how some complex vintage level cards work in a cube environment. Vintage Cube Cards Explained
While the end result is correct, your summary, or terminology, is not. Activated abilities activate; triggered abilities trigger. Triggers can never activate and vice versa.
You activate Tide so that ability goes onto the stack. You hold priority and activate it again and put that ability on the stack. You can do this 5 times. None of these are triggers.
With those activated abilities on the stack, you Disenchant the Tide. Now, you have 1 trigger on the stack: the one making you return all exiled lands. As you said, there aren't any yet so nothing is returned when that trigger resolves. Now, all the activated abilities resolve to exile the targeted lands and they remain exiled for the rest of the game since nothing brings them back.
Suppose I have Parallax Tide on the field with 5 counters. Could I do this:
A - Remove a counter from Parallax Tide, remove target Land from the game.
Holding Priority
B - Remove a counter from Parallax Tide, remove target Land from the game.
Holding Priority
C - Remove a counter from Parallax Tide, remove target Land from the game.
Holding Priority
Disenchant Targeting Parallax Tide
4 Triggers are put onto the stack with Disenchant at the very top. Disenchant would resolve first and Parallax Tide would leave play. Its own trigger would activate and return all lands it exiled back to play (no lands were exiled)
C, B then A would trigger removing the land forever because Parallax Tide is gone.
Vintage Cube Cards Explained
Here are some other articles I've written about fine tuning your cube:
1. Minimum Archetype Support
2. Improving Green Archetypes
3. Improving White Archetypes
4. Matchup Analysis
5. Cube Combos (Work in Progress)
Draft my Cube - https://cubecobra.com/cube/overview/d8i
You activate Tide so that ability goes onto the stack. You hold priority and activate it again and put that ability on the stack. You can do this 5 times. None of these are triggers.
With those activated abilities on the stack, you Disenchant the Tide. Now, you have 1 trigger on the stack: the one making you return all exiled lands. As you said, there aren't any yet so nothing is returned when that trigger resolves. Now, all the activated abilities resolve to exile the targeted lands and they remain exiled for the rest of the game since nothing brings them back.